Noncyclic aliphatic compounds

Group III Solid, noncyclic, aliphatic compounds containing only nitro and (or) nitrate substituents ... 

Tetracblorotbiopbene under Single-Ring Heterocyclic Sulfur Compounds Tetraethyl Lead under Lead Compounds Tetrahydrofuran under Noncyclic Aliphatic or Aromatic Ethers Thallium... 

The special types of bonding in three-membered ethyleneimine rings (41—43) have been studied using microwave spectroscopy (44—47), electron diffraction (48), and photoelectron spectroscopy (49—51), and have occupied theoretical chemists up to the present day (52). These studies reveal that ethyleneimine has a distincdy shortened C—C bond of 0.148 nm (as compared to 0.154 nm in open-chain compounds) and a noticeably lengthened C—N bond of 0.149 nm (compared to 0.146 nm). Because of the high s character of the free electron pair on the nitrogen, ethyleneimine also shows a lower basicity (p Ka = 7.98) than noncyclic aliphatic amines such as dimethyl amine (p Ka = 10.7) (53). 

Each fraction of distilled petroleum still contains a complex mixture of chemicals but they can be somewhat categorized. A certain sample of straight-run gasoline (light naphtha) might contain nearly 30 aliphatic, noncyclic hydrocarbons, nearly 20 cycloaliphatic hydrocarbons (mainly cyclopentanes and cyclohexanes) sometimes called naphthenes, and 20 aromatic compounds. 

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